net: qede: Use FIELD_SIZEOF directly instead of reimplementing its function

FIELD_SIZEOF is defined as a macro to calculate the specified value. Therefore,
We prefer to use the macro rather than calculating its value.
Signed-off-by: Nzhong jiang <zhongjiang@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qede/qede.h

@@ -440,7 +440,7 @@ struct qede_fastpath {
 	struct qede_tx_queue	*txq;
 	struct qede_tx_queue	*xdp_tx;
 
-#define VEC_NAME_SIZE	(sizeof(((struct net_device *)0)->name) + 8)
+#define VEC_NAME_SIZE  (FIELD_SIZEOF(struct net_device, name) + 8)
 	char	name[VEC_NAME_SIZE];
 };